EP3782275A1 - Convertisseur de tension continue et son fonctionnement - Google Patents

Convertisseur de tension continue et son fonctionnement

Info

Publication number
EP3782275A1
EP3782275A1 EP19746020.7A EP19746020A EP3782275A1 EP 3782275 A1 EP3782275 A1 EP 3782275A1 EP 19746020 A EP19746020 A EP 19746020A EP 3782275 A1 EP3782275 A1 EP 3782275A1
Authority
EP
European Patent Office
Prior art keywords
voltage
phase
primary
converter
bridge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP19746020.7A
Other languages
German (de)
English (en)
Inventor
Markus ZOCHER
Martin Hergt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP3782275A1 publication Critical patent/EP3782275A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/337—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration
    • H02M3/3376—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration with automatic control of output voltage or current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33584—Bidirectional converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/01—Resonant DC/DC converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33571—Half-bridge at primary side of an isolation transformer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Definitions

  • the invention relates to a DC-DC converter with a dual active bridge topology and a series resonance circuit for each AC voltage phase and a method for operating such a DC-DC converter.
  • a DC-DC converter with a dual active bridge topology has two converter units, each with several semiconductor switches, and a transformer unit connected between the two converter units.
  • a converter unit With a converter unit, a primary AC voltage is generated from an input DC voltage, which is transformed by the transformer unit into a secondary AC voltage.
  • the other converter unit generates an output DC voltage from the secondary AC voltage.
  • the AC voltages can be single or multi-phase and are clocked at a clock frequency with which the semiconductor switches are controlled.
  • the invention relates to a DC / DC converter designed in dual active bridge topology, which has a series resonance circuit with at least one capacitor and at least one coil for each AC voltage phase.
  • the power or the DC output voltage of such a DC-DC converter is usually regulated by changing a phase shift between the primary and the secondary AC voltage.
  • FR 3 050 593 A1 discloses a method and a system for controlling a DC / DC converter with a double bridge topology with two converters for converting a first DC voltage into a second DC voltage. In this case, an optimal phase shift angle between two AC voltages is determined, which are generated for converting the first DC voltage into the second DC voltage.
  • the invention has for its object to optimize the efficiency of a DC converter with a dual active bridge topology and a series resonance circuit for each AC voltage phase.
  • the object is achieved according to the invention by a method with the features of claim 1 and a DC voltage converter with the features of claim 3.
  • the method according to the invention is directed to the operation of a DC voltage converter for generating a multiphase primary AC voltage from an input DC voltage, transforming the primary AC voltage into a secondary AC voltage with a transmission ratio and generating an output DC voltage from the secondary AC voltage, the DC voltage converter being a dual active bridge Has topology with a series resonance circuit for each de AC voltage phase.
  • a phase shift between the primary AC voltage and a corresponding series resonant circuit current is regulated to zero by changing a clock frequency clocking the AC voltages when the ratio of the DC output voltage to the DC input voltage is greater than the transmission ratio, and a phase shift between the secondary AC voltage and regulating a corresponding series resonant circuit current by changing the clock frequency to zero if the ratio of the off DC voltage to the input DC voltage is less than the gear ratio.
  • the core idea of the invention is to regulate the phase shift between the primary or secondary AC voltage of the DC voltage converter and a corresponding series resonance circuit current by changing the clock frequency of the AC voltage to zero. Whether the phase shift between the primary or secondary AC voltage and the series resonant circuit current is regulated to zero depends on whether the ratio of the DC output voltage to the DC input voltage is greater or less than the transformation ratio of the transformer unit. On the one hand, the regulation reduces continuity losses, since the reactive power flowing from a primary or secondary side into a series resonance circuit is reduced. Furthermore, switching losses when switching the voltage bridges are significantly reduced, since a primary-side or secondary-side voltage bridge is switched only when the current through the corresponding series resonant circuit is zero or at least almost zero (so-called zero current switching).
  • the mean value of phase shifts between a respective AC voltage phase and that caused by the series resonance circuit of this AC voltage during the current phase. So there is a mean value of phase shifts between each AC voltage phase of the primary AC voltage and the current flowing through the series resonant circuit of this AC voltage phase to zero when the ratio of the DC output voltage to the DC input voltage is greater than the transmission ratio, and an average of Pha Senshifts between one AC voltage phase of the secondary AC voltage and the current flowing through the series resonance circuit of this AC voltage phase regulated to zero when the ratio of the DC output voltage to the DC input voltage is less than the translation ratio.
  • mean values of phase shifts between an alternating voltage phase of the primary or secondary alternating voltage and the corresponding series resonant circuit current are determined and regulated to zero. This can advantageously compensate for measurement inaccuracies in the determination of the individual phase shifts and small fluctuations in the phase relationships between the different AC phases.
  • An embodiment of the invention provides that a change in a phase shift between the primary AC voltage and the secondary AC voltage regulates a power transmitted by the DC voltage converter to a power setpoint or the output DC voltage to a voltage setpoint.
  • This embodiment of the inven tion provides a two-size control of the DC voltage converter, in which, in addition to the clock frequency, the phase shift between the primary AC voltage and the secondary AC voltage is changed. As a result, the power or the DC output voltage of the DC / DC converter can be regulated with an optimized efficiency.
  • phase shift between an alternating voltage phase of the primary alternating voltage and a corresponding alternating voltage phase of the secondary alternating voltage or a Mean value of phase shifts between an alternating voltage phase of the primary alternating voltage and a corresponding alternating voltage phase of the secondary alternating voltage.
  • An inventive DC converter for generating a multi-phase primary AC voltage from an input DC voltage, transforming the primary AC voltage into a secondary AC voltage with a translation ratio and generating an output DC voltage from the secondary AC voltage comprises a primary-side voltage bridge with several semiconductor switches for generating for each AC voltage phase the primary AC voltage from the input DC voltage, a transformer unit for transforming the primary AC voltage into the secondary AC voltage, a secondary-side voltage bridge with several semiconductor switches for generating the output DC voltage from the secondary AC voltage for each AC voltage phase, a series resonance circuit and a measuring device arrangement for each AC voltage phase.
  • the measuring device arrangement is designed to detect the DC input voltage, the DC output voltage and temporal profiles of several AC phases of the primary AC voltage, the corresponding AC voltage phases of the secondary AC voltage and the currents flowing through the series resonant circuits of these AC phases.
  • the DC / DC converter comprises a control unit which is designed to regulate an average of the phase shifts between each of these AC voltage phases of the primary AC voltage and the current flowing through the series resonant circuit of this AC voltage phase by changing one of the AC voltages clocking the clock frequency to zero, if the ratio of the DC output voltage to the DC input voltage is greater than the transmission ratio, and an average of the phase shifts between each of these AC voltage phases of the secondary AC voltage and that flowing through the series resonant circuit of this AC voltage phase regulate the current to zero by changing the clock frequency if the ratio of the DC output voltage to the DC input voltage is less than the transmission ratio.
  • a DC voltage converter according to the invention enables the method according to the invention to be carried out.
  • the advantages of a DC / DC converter according to the invention correspond to the advantages of the method according to the invention already mentioned above and are not repeated here.
  • each primary-side voltage bridge is a half-bridge, in the bridge arms of which a semiconductor switch is arranged and the bridge branch is connected to a primary winding of the transformer unit
  • each secondary-side voltage bridge is a half-bridge, in the bridge arms of which a semiconductor switch is arranged is and the bridge branch is connected to a secondary winding of the transformer unit.
  • Voltage bridges designed as half bridges advantageously reduce the number of semiconductor switches and thus the space requirement and the material costs for the voltage bridges compared to voltage bridges formed as full bridges.
  • the transformer unit is designed as a multi-phase transformer or has a transformer for each AC voltage phase.
  • the design of the transformer unit as a multi-phase transformer simplifies the design of the DC / DC converter compared to the design with individual transformers, but this is also possible.
  • the control unit has at least one first phase detector for determining a phase shift between an AC voltage phase of the primary AC voltage and the current flowing through the series resonance circuit of this AC voltage phase and a second phase detector for determining a phase shift between an AC voltage phase of the secondary AC voltage and the current flowing through the series resonance circuit of this AC voltage phase.
  • control unit is designed to regulate a power transmitted by the DC voltage converter to a power setpoint or the output DC voltage to a voltage setpoint by changing a phase shift between the primary AC voltage and the secondary AC voltage.
  • each series resonant circuit is arranged on the secondary side or the primary side of the transformer unit, or the components of each series resonant circuit are distributed over the secondary side and the primary side of the transformer unit.
  • the design of the series resonance circuits and the distribution of the components of the series resonance circuits on the secondary side and the primary side of the transformer unit is irrelevant to the invention, that is, the invention can advantageously be used for different versions of the series resonance circuits, since the transformer unit for the currents of the series resonance circuits in Essentially only causes an impedance change.
  • FIG. 1 shows a circuit diagram of a three-phase DC voltage converter with a dual active bridge topology and a series resonance circuit for each AC voltage phase
  • FIG. 3 shows a block diagram of a clock frequency controller for regulating a clock frequency of a DC voltage converter
  • FIG. 4 shows time profiles of an AC voltage phase of a primary AC voltage, which correspond to the AC voltage phase of a secondary AC voltage and the current flowing through a series resonant circuit of this AC voltage phase without a change in the clock frequency of the AC voltage
  • FIG. 5 shows time profiles of an AC voltage phase of a primary AC voltage, which correspond to this AC voltage phase of a secondary AC voltage and the current flowing through a series resonant circuit of this AC voltage phase with a change in the clock frequency of the AC voltage.
  • Figure 1 shows a circuit diagram of a three-phase DC voltage converter 1 for converting an input DC voltage Ui n into an output DC voltage U out ⁇
  • the DC converter 1 comprises a first converter unit 3 for generating a primary AC voltage from the input DC voltage Ui n , a transformer unit 5 for transforming the primary AC voltage into a secondary AC voltage, a second converter unit 7 for generating the DC output voltage U out from the secondary AC voltage and a series resonance circuit 9 for each AC voltage phase.
  • the DC / DC converter 1 has a dual active bridge topology.
  • the first converter unit 3 has a primary-side voltage bridge 11 for each AC voltage phase U Pi , U P 2, U P 3 of the primary AC voltage.
  • Each primary-side voltage bridge 11 is configured as a half-bridge, in the bridge arms of which a semiconductor switch 13 and a parallel to the semiconductor switch 13 free-wheeling diode 15 are arranged and the bridge branch is connected to a primary winding 17 of the transformer unit 5.
  • the second converter unit 5 has a voltage bridge 19 on the secondary side for each AC voltage phase U Si , Us2 / Us3 of the secondary AC voltage.
  • Each secondary-side voltage bridge 19 is formed as a half bridge, in the bridge arms of which a semiconductor switch 13 and a pa rallel to the semiconductor switch 13 connected freewheeling diode 15 are arranged and the bridge branch via a series resonant circuit 9 is connected to a secondary winding 21 of the transformer unit 5.
  • Each series resonant circuit 9 has a capacitor 23 and a coil 25 connected in series.
  • the transformer unit 5 is designed as a three-phase transformer.
  • the DC-DC converter 1 also has a measuring device arrangement 27 and a control unit 29, which are not shown in FIG. 1 (see FIG. 2).
  • the measuring device arrangement 27 has measuring devices for detecting the DC input voltage u ⁇ , the DC output voltage Uout, one transmitted by the DC-DC converter 1 Power P and time profiles of the alternating voltage phases Upi, Up2, U p 3 of the primary alternating voltage, the alternating voltage phases U Si , Us 2 / Us 3 of the secondary alternating voltage and the currents I p , I 2 , I 3 flowing through the series resonance circuits 9 on.
  • the control unit 29 is designed to have an average value of phase shifts between an alternating voltage phase U pp , U p2 , U p3 of the primary alternating voltage and the current Ip, I flowing through the series resonance circuit 9 of this alternating voltage phase U pp , U p2 , U p3 2 , I 3 by changing a clock frequency f clocking the AC voltages to zero when the ratio of the DC output voltage U out to the DC input voltage Up n is greater than the transmission ratio n of the transformer unit 5, and an average of phase shifts between each AC voltage phase U Sp , U S2 , U S3 of the secondary AC voltage and the current flowing through the series resonance circuit 9 of this AC voltage phase U Sp , U S2 , U S3 current Ip, I 2 , I 3 to zero when the ratio of the output DC voltage U 0ut to the input DC voltage Up n is less than the transmission ratio n.
  • control unit 29 is designed to control the power P transmitted by the DC / DC converter 1 by changing a phase shift between the primary AC voltage and the secondary AC voltage to a power setpoint P s .
  • FIG 2 shows a control circuit for operating the DC-DC converter 1 shown in Figure 1 according to the inventive method.
  • the control circuit has the control unit 29, a control arrangement 31 for controlling the semiconductor switch 13, the DC-DC converter 1 and the measuring device arrangement 27.
  • VCO Voltage- Controlled Oscillator
  • the input DC voltage Ui n the output DC voltage U out / the power P transmitted by the DC converter 1 and the time profiles of the AC voltage phases U Pi , U P 2, U P 3 of the primary AC voltage, the AC voltage phases U Si , Us2 / U S 3 of the secondary alternating voltage and the currents I p , I 2 , I 3 flowing through the series resonant circuits 9.
  • the clock frequency controller 33 are from the measuring device arrangement 27, the input DC voltage u ⁇ , the output DC voltage U out and the time profiles of the AC voltage phases U PP , U P 2, U P 3 of the primary AC voltage, the AC voltage phases U Si , U S 2, U S 3 of the secondary alternating voltage and the currents I p , I2, I3 flowing through the series resonance circuits 9 are transmitted.
  • the clock frequency controller 33 it averages the clock frequency f in the manner described in more detail below with reference to FIG. 3 and transmits it to the voltage-controlled oscillator 35.
  • the voltage-controlled oscillator 35 generates a square-wave voltage of the clock frequency f, which serves as a clock signal S f for the control arrangement 31.
  • a deviation of the power P of the DC-DC converter 1 determined by the measuring device arrangement 27 from the power setpoint P s is transmitted to the phase shift controller 37.
  • the phase shift controller 37 transmits a phase shift signal S P to the control arrangement 31, through which the power P is regulated by a change in the phase shift between the primary AC voltage and the secondary AC voltage to the power setpoint P s .
  • the phase shift controller 37 is, for example, designed as a PI controller.
  • the control arrangement 31 controls the semiconductor switch 13 of the DC-DC converter 1.
  • IGBT insulated-gate bipolar transistor
  • MOSFET metal-oxide-semiconductor field-effect transistor
  • FIG. 3 shows a block diagram of the clock frequency controller 33, whereby for example the evaluation of a primary alternating voltage-phase U PI, of the corresponding secondary alternating voltage phase Usi and the current I p through the korrespondie ⁇ Governing series resonant circuit 9 is shown.
  • a digital sign signal is continuously determined using a digitizing element 39 to 41, indicating a current sign of the variable U PP , Usi, Ii.
  • Each digitizing element 39 to 41 is designed, for example, as a Schmitt trigger.
  • the for the primary AC voltage U phase PP and the current I p sign signals obtained are fed to a first digital phase detector 43, the resulting phase shift ⁇ bung determined between the primary AC voltage U phase PP and the current Ii.
  • the phase detectors 43, 44 each have an EXOR gate, for example.
  • the comparator 47 determines a ratio U out / Up n of the DC output voltage U out to the DC input voltage Up n and compares the ratio with the transmission ratio n. If the ratio U out / Up n is greater than the transmission ratio n, the selection element 45 the output signal of the first phase detector 43 is forwarded to an averaging element 49. If the ratio U out / Up n is less than the transmission ratio n, the inverted output signal of the second phase detector 44 is forwarded to the averaging element 49 by the selection element 45.
  • the output signal of the second phase transmitter 44 is inverted in order to change the clock frequency f in the case U out / U pn ⁇ n in a different direction than in the case U out / U pn > n.
  • the other two primary AC voltage phases Up2, Up3, the corresponding secondary AC voltage phases Us2 / Us3 and currents I 2 , I 3 are evaluated by the corresponding series resonant circuits 9, so that the averaging element 49 for each AC phase of the DC converter 1, the phase shift between the primary AC voltage phase U Pp , U P2 , U P3 and the current Ip, I 2 , I 3 is supplied through the corresponding series resonance circuit 9 when the ratio U out / Ui n is greater than the transmission ratio n, and as an inverted one signal, the phase shift between the secondary alternating voltage phase U Si, Us 2 / Us 3 and the current Ip, I 2, I 3 pondierenden by the korres ⁇ series resonant circuit 9 is supplied, when the ratio is U out / Up n is smaller than the gear ratio n ,
  • the averaging element 49 has a low-pass filter, with which the signals supplied to it are filtered, and forms an average value from the filtered signals, which it outputs to a regulating element 51.
  • the control element 51 determines the clock frequency f for the control of the semiconductor switch 13 from the signal supplied to it by the centering element 49.
  • the control element 51 is designed, for example, as a PI controller.
  • FIGS. 4 and 5 illustrate the effect of the invention on courses of a primary AC voltage phase U Pi , the corresponding secondary AC voltage phase U Si and the current Ii through the corresponding series resonance circuit 9 as a function of a time t in the event that the ratio U out / Ui n is greater than the gear ratio n.
  • FIG. 4 shows the courses without changing the clock frequency f.
  • the current Ii through the series resonant circuit 9 leads the primary AC phase U Pi and the secondary AC phase U Si .
  • high switching losses occur in the primary-side voltage bridge 11 of the primary AC voltage phase U PI and the secondary-side voltage bridge 19 of the secondary AC voltage phase U Si , since the instantaneous value of the current Ii at all times in which the sign of an AC voltage phase U Pi , U Si changed, is relatively large.
  • FIG. 5 shows the curves with a regulation according to the invention of the phase shift between U Pi and I p to zero by changing the clock frequency f.
  • the regulation reduces the passage losses of the primary-side voltage bridge 11 of the primary AC voltage phase U Pi compared to the situation shown in FIG. 4, since no reactive power flows from this voltage bridge 11 into the corresponding series resonance circuit 9. Furthermore, the Umschaltver losses are significantly reduced because this primary-side voltage bridge 11 is switched exactly when the current Ip is zero (so-called zero current switching). This improves efficiency.
  • the secondary side voltage bridge 19 of the secondary alternating voltage phase U Si caused although still a certain power loss, in comparison to that shown in Figure 4 situation, however, these are clotting ger, since the maximum value of the current Ii as well as the instantaneous values of the current Ii in the Shift Z eit Vietnamese blocks 19 are lower.
  • the exemplary embodiments of a DC-DC converter 1 according to the invention and the method according to the invention described with reference to FIGS. 1 to 5 can be modified in various ways to other exemplary embodiments.
  • the DC converter 1 may have one of three different numbers of AC phases.
  • it can also be single-phase.
  • the DC-DC converter 1 has, for example, a primary-side voltage bridge 11 and a secondary-side voltage bridge 19, which are each designed as a full bridge.
  • phase shift between one of the primary AC voltage phases U Pi , U P2 , U P3 and the current I p , I 2 , I 3 of the corresponding series resonant circuit 9 is detected and regulated to zero when the ratio U out / Ui n is greater than the transmission ratio n, or the phase shift between one of the secondary alternating voltage phases U Si , Us 2 / Us 3 and the current I p , I 2 , I 3 of the corresponding series resonant circuit 9 is detected and regulated to zero if the ratio U out / Ui n is less than the transmission ratio n, instead of all primary AC phases U PP , U P2 , U P3 , secondary AC phases U Si , Us 2 / Us 3 and currents I p , I 2 , I 3 and to form mean values of phase shifts.
  • the transformer unit 5 has a transformer for each AC phase instead of a multiphase transformer.
  • the control unit 29 can also be made for the control unit 29 to be designed for this purpose. Det is, by changing a phase shift between the primary AC voltage and the secondary AC voltage to regulate the output DC voltage U out to a voltage setpoint instead of regulating the transmitted power P to a power setpoint P s .

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

L'invention concerne un convertisseur de tension continue (1) destiné à générer une tension alternative primaire polyphasée à partir d'une tension continue d'entrée (Uin), transformer la tension alternative primaire en une tension alternative secondaire avec un rapport de transmission (n) et générant une tension de sortie continue (Uout) à partir de la tension alternative secondaire. Le convertisseur de tension continue (1) possède une topologie à double pont actif comprenant un circuit de résonance série (9) pour chaque phase de tension alternative. Si le rapport de la tension de sortie continue (Uout) à la tension d'entrée continue (Uin) est supérieur au rapport de transmission (n), un déphasage entre la tension alternative principale et un courant de circuit résonnant série correspondant est réglé à zéro par un changement de fréquence d'horloge (f) cadençant les tensions alternatives. Si le rapport de la tension de sortie continue (Uout) à la tension d'entrée continue (Uin) est inférieur au rapport de transformation (n), un déphasage entre la tension alternative secondaire et un courant de circuit résonnant série correspondant est réglé à zéro par un changement de la fréquence d'horloge (f).
EP19746020.7A 2018-07-23 2019-07-15 Convertisseur de tension continue et son fonctionnement Pending EP3782275A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP18184944.9A EP3599711A1 (fr) 2018-07-23 2018-07-23 Convertisseur de tension continue et son fonctionnement
PCT/EP2019/068997 WO2020020685A1 (fr) 2018-07-23 2019-07-15 Convertisseur de tension continue et son fonctionnement

Publications (1)

Publication Number Publication Date
EP3782275A1 true EP3782275A1 (fr) 2021-02-24

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EP18184944.9A Withdrawn EP3599711A1 (fr) 2018-07-23 2018-07-23 Convertisseur de tension continue et son fonctionnement
EP19746020.7A Pending EP3782275A1 (fr) 2018-07-23 2019-07-15 Convertisseur de tension continue et son fonctionnement

Family Applications Before (1)

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EP18184944.9A Withdrawn EP3599711A1 (fr) 2018-07-23 2018-07-23 Convertisseur de tension continue et son fonctionnement

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US (1) US11824458B2 (fr)
EP (2) EP3599711A1 (fr)
CN (1) CN112470387A (fr)
WO (1) WO2020020685A1 (fr)

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Publication number Priority date Publication date Assignee Title
CN113258790B (zh) * 2021-07-15 2021-09-14 深圳市永联科技股份有限公司 变换器控制方法及相关装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8446744B2 (en) * 2008-03-06 2013-05-21 Koninklijke Philips Electronics N.V. Method for controlling a switching device of a resonant power converter, especially in order to provide a required power, especially for an X-ray generator
JP5963125B2 (ja) * 2011-07-22 2016-08-03 株式会社Ihi 直流電力変換装置
JP6160547B2 (ja) * 2014-04-10 2017-07-12 トヨタ自動車株式会社 電力変換装置及び電力変換方法
FR3050593A1 (fr) * 2016-04-25 2017-10-27 Inst Supergrid Procede de commande d'un convertisseur dc/dc a double pont

Also Published As

Publication number Publication date
US11824458B2 (en) 2023-11-21
EP3599711A1 (fr) 2020-01-29
CN112470387A (zh) 2021-03-09
US20210297000A1 (en) 2021-09-23
WO2020020685A1 (fr) 2020-01-30

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